Smart Power
Fraunhofer Institute for Integrated Circuits
Smart Power Design
Mixed signal ASICs allow for developing sophisticated and low-cost systems which perform complex measurement and control tasks. The system achieves high reliability via monitoring of operating parameters like temperature, voltages and current. Capacities up to 10 W can directly be controlled on the devices. Higher capacities are achieved through additional power modules.
Project Examples
Integrated Signal Evaluation for Magnetic Rotary Encoders
A 1.2 µm CMOS mixed signal ASIC was developed for signal evaluation of fast, high-resolution rotary encoders. Four analog channels are integrated for the editing of the sine and cosine signals and for a reference and separation trace, which are measured by a magnetic resistance bridge. Automatic gain control, offset compensation and phase correction are used to generate standardized sine and cosine signals, which are interpolated by a 5 bit ADC.
ASICs for Drive Control
A 5 V CMOS ASIC was implemented for application in drive control. The chip consists of five 14 bit SD ADCs for measurement of two-phase currents, motor voltage and temperature of power electronics and electric motor. A protective circuit for short-circuit fault and overvoltage is implemented. Two additional 14 bit ADCs and two 11 bit DACs are designed for additional control functions.
ASICs for Magnetic Switches
Looms require a high number of magnetic switches, which have to be activated individually at each weaving sequence. To meet this requirement a mixed signal ASIC was developed, which comprises half-bridge drivers to trigger 16 magnetic switches. The devices can be cascaded arbitrarily. High reliability is achieved through open circuit and short-circuit fault detection for each driver as well as through temperature and voltage control for each chip. The chip is manufactured in a 0.8 µm CMOS high voltage process.
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